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Not on the Department of Education’s list: it is here as OpenStreetMap names and maps it. Whether it is public or private is taken from OpenStreetMap or from its name. Something wrong?

Where OpenStreetMap has a school of this name in this town.
Cotabato State University (CotSU) dates its founding to 1924, when it opened as Cotabato High School. It later became Cotabato City National High School, a name the Bangsamoro government's account gives for the years 1977 to 1983.
Batas Pambansa Blg. 484, approved on June 10, 1983, turned Cotabato City National High School into the Cotabato City State Polytechnic College (CCSPC). The college was to teach agriculture, fisheries, forestry and industrial technology, and to keep a high school program.
Republic Act 10585, approved on May 24, 2013, turned the polytechnic college into Cotabato State University, with its main campus in Cotabato City. Former Maguindanao Representative Bai Sandra Sema wrote the House bill. The conversion took effect in April 2021. At a later ceremony, CHED officials formally conferred university status and Dr. Sema G. Dilna was installed as its first university president.
CotSU marked its 100th anniversary in February 2024. Its alumni include the late Senator Salipada Pendatun, Simeon Datumanong and Zacaria Candao.
As the crow flies, among the schools pinned where they stand.